++libgit2 to latest development
Remove GIT_REF_PACKED and GIT_REF_HAS_PEEL
Updates for the immutable ref API
Remove -[GTRepository packAllWithError:]
Remove some diff file flags
Remove test for packed ref listing
Misc API fixes
Explicit comparison
Merge pull request #146 from libgit2/update-libgit2

Update libgit2 to latest development